{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Methods : We examined immunohistochemical expression of Hh signaling mediators Sonic Hedgehog ( Shh ) and Glioblastoma ( Gli ) 2 in paraffin - embedded normal versus histologically characterized human MTC tissue ."}
{"Chemical": []}